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Circularly polarized coaxial embedded circular waveguide mode exciter

A mode excitation and coaxial waveguide technology, applied in waveguide devices, resonators, electrical components, etc., can solve the problems of complex structure, high assembly precision requirements, low conversion efficiency and mode purity, and solve the problems of dense oscillation spectrum, Effect of Coupling Efficiency Improvement

Inactive Publication Date: 2020-02-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of the existing high-order mode exciter with complex structure, high assembly precision requirements, too many transition devices, low conversion efficiency and mode purity, the present invention proposes a circularly polarized coaxial embedded circular waveguide mode exciter

Method used

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  • Circularly polarized coaxial embedded circular waveguide mode exciter
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  • Circularly polarized coaxial embedded circular waveguide mode exciter

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Embodiment 1

[0027] Embodiment 1: A circularly polarized coaxial embedded circular waveguide mode exciter, see figure 1 As shown, the coaxial embedded circular waveguide mode exciter includes three parts connected in sequence along the axial direction, the first part is to make the TE in the cavity 53 The mode is completely reflected back to the cut-off section of the cavity, which is a "truncated circular" coaxial waveguide structure with a constant radius of the inner conductor and a gradually expanding radius of the outer conductor; the second part is the waveguide resonant section using the Bragg diffraction grating model. It is a uniform open coaxial waveguide structure; the third part is to ensure TE 53 The radiation section where most of the mode power is transmitted by radiation is a section of "truncated circular" coaxial waveguide structure with a constant radius of the inner conductor and a gradually expanding radius of the outer conductor. combine figure 1 , and its structura...

Embodiment 2

[0038] Embodiment 2: further improving the coupling mode and increasing the coupling efficiency. Such as Image 6 As shown, the small hole coupling is changed to the gap coupling, and the dimensions other than the gap are as in the first embodiment. In this embodiment, the gap width is 1.44mm, the gap spacing is 4mm, and the helix angle is 60°. Using the eigenmode design of HFSS, it is found that the coupling efficiency of the slot-coupled coaxial embedded circular waveguide mode exciter is significantly improved compared with the pinhole-coupled coaxial embedded circular waveguide mode exciter. At the same time, the gap opened along the helix further reduces the coaxial TE 53 The component of mode right-handed circular polarization excites the coaxial TE with higher purity left-handed circular polarization 53 mold. Such as Figure 9 As shown, the coupling efficiency of the energy in the slot-coupled circular waveguide into the coaxial resonant cavity reaches 98.01%. The ...

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Abstract

The invention discloses a circularly polarized coaxial embedded circular waveguide mode exciter and belongs to the field of a mode exciter. The mode exciter is of a coaxial waveguide structure with aninner conductor in a circular waveguide form and comprises a cut-off section, a resonance section and a radiation section which are connected in sequence, in the resonance section, coupling gaps or coupling hole arrays which are periodically and spirally distributed and meet Bragg resonance conditions in the angular direction and the axial direction are arranged on a waveguide wall of the inner conductor in the axial direction. The mode exciter is advantaged in that the mode exciter is simple in structure, high in vector mode purity, large in coupling efficiency, high in purity bandwidth andsmall in stray mode number.

Description

technical field [0001] The invention belongs to the field of mode exciters, in particular to a circularly polarized coaxial embedded circular waveguide mode exciter. Background technique [0002] A cyclotron oscillator is a typical representative of a high-power millimeter-wave source, which has the advantages of high power, long pulse and continuous wave output. It is mainly used in millimeter-wave radar, communication, high-energy physics, controlled thermonuclear fusion, high-power microwave weapons and high-power electromagnetic heating. The working mode in the gyrotron is usually a high-order side corridor mode or a high-order bulk mode. Such high-order modes are not convenient for direct use and transmission. Quasi-optical mode converters are usually used to convert them into low-order modes that are easy to use and transmit. In order to accurately test the performance of the quasi-optical mode converter, it is necessary to design a high-purity circularly polarized hi...

Claims

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Application Information

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IPC IPC(8): H01P1/16H01P7/04
CPCH01P1/16H01P7/04
Inventor 李浩欧美玲李殿亮王克强李天明周翼鸿汪海洋胡标
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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